The USSR was just as capitalist as the PRC. Because it had generalized commodity production and wage-labor. You can’t have a socialist mode of production in just one country, as the interaction with capitalist countries will infect your system.
The PRC is a highly technocratic advanced capitalist democracy, and yes, it will likely outpace the west in a number of key statistics over time, that doesn’t make it socialist, because the productive mode is capitalism.
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